The main task of technical committees is to prepare International Standards. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. The work of preparing International Standards is normally carried out through ISO technical committees. All rights reserved iiiĤ Provläsningsexemplar / Preview Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel Fax Web Published in Switzerland ii ISO 2011 All rights reservedģ Contents Page Foreword.iv Introduction.v 1 Scope Normative references Terms and definitions Symbols Role of datums General concepts General Intrinsic characteristics of surfaces associated with datum features General A single datum established from a single feature Common datum established from two or more single features simultaneously Datum systems established in a defined sequence from two or more single features Single datums, common datums and datum systems General Single datums Common datums Datum systems Graphical language General Indication of datum features Datum feature indicator Datum feature identifier Datum targets Specification of datums and datum systems Indication and meaning of rules General Rules.22 Annex A (normative) Association for datums.37 Annex B (informative) Invariance classes.47 Annex C (informative) Examples.49 Annex D (informative) Former practices.71 Annex E (informative) Examples of a datum system or a common datum established with contacting features.73 Annex F (normative) Relations and dimensions of graphical symbols.79 Annex G (informative) Relationship to the GPS matrix model.80 Bibliography. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. 1 INTERNATIONAL STANDARD ISO 5459 Second edition Geometrical product specifications (GPS) Geometrical tolerancing Datums and datum systems Spécification géométrique des produits (GPS) Tolérancement géométrique Références spécifiées et systèmes de références spécifiées Reference number ISO 2011Ģ Provläsningsexemplar / Preview COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved.
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